RemoteFX is available through Server 2008 R2 SP1 with Hyper-V. RemoteFX is a feature built into the new RDC. THe only way I've seen to manually configure RemoteFX is when adding an appropriate RemoteFX adapter to a Virtual Machine.
With my own research into RemoteFX, I'm attempting to see if HPC GPU-based computing allows multiple VM's to dynamically utilize all the GPUs computing power or does RemoteFX with HPC still require individual Adapater assignment.
MCTS, MCP, A+ Microsoft Partner